Study On Synergistic Adsorption Of Heavy Metals And Phenol By Magnetic Field And Carbon Nanotubes

The treatment of water pollution is one of the important tasks of China's environmental protection prevention and control work.Due to the influence of economic development and other factors,there are many problems in the control and treatment of water pollution in China.The current status of water pollution has been presented as a whole.As the trend worsens,there will be no increase in industrial wastewater rich in refractory organic and heavy metal pollutants.For a long time,the treatment of these industrial wastewaters has mainly focused on the removal of single components.In the actual water environment,organic pollutants and heavy metal pollutants coexist in the same water body,such as printing and dyeing wastewater,oil refining wastewater,and concentrated industrial wastewater.These wastewater components are complex and require strict treatment.Therefore,how to economically and effectively remove organic pollutants and heavy metals is currently the focus of wastewater treatment in the world.Adsorption method is one of the most commonly used methods for sewage treatment.It has the advantages of fast adsorption reaction time,high adsorption efficiency,no need to add adsorption catalyst,and strong adaptability.It is critical to use suitable adsorbents when treating wastewater with adsorption.This article involves the following research,including the synthesis of magnetic carbon nanotubes with high adsorption capacity,and the magnetic field/carbon nanotubes synergistic removal of heavy metals and phenols in water based on this,and study the adsorption performance and adsorption mechanism of the composites.The synthesis of magnetic carbon nanotubes is firstly purified by using mixed acid to improve the surface properties,and the iron oxide particles are loaded on the surface of the material by a hydrothermal synthesis method to make the material easy to magnetically separate and chemically loaded on the surface of the magnetic material.The thiol groups and amino groups with strong binding ability to heavy metals and phenol were loaded,and finally NH₄-SH-Fe₃O₄/O-MWCNTs composites were prepared by transmission electron microscopy,Fourier infrared spectroscopy,hysteresis loop analysis,XPS analysis,and X-ray diffraction.Analysis,thermogravimetry,and other characterization methods analyze the surface morphology and composition of the composite.On this basis,a self-made magnetic adsorption cycle adsorption equipment was used for dynamic adsorption experiments.The effect of magnetic field strength,water velocity,and temperature on the adsorption of composites was investigated using an L₉?3⁴?orthogonal experiment table.Comparisons were made based on the results of range analysis.The order of the influence of experimental factors on the experimental results was obtained,and the optimal experimental parameters for the selected experimental conditions were obtained:magnetic field strength 0.27 T,temperature30?,water velocity 0.17 m/s,magnetic field When recycled water is used together with NH₂-SH-Fe₃O₄/o-MWCNTs,the adsorption amount of magnesium ion,cadmium ion and phenol is the highest.According to this optimal condition,the effects of adsorption time,temperature and magnetic field on the adsorption process were studied.The results showed that the pseudo-second-order kinetic model was more suitable for describing the adsorption of Mg²⁺,Cd²⁺,and phenol on NH₂-SH-Fe₃O₄/o-MWCNTs.The process and the theoretical values are closer to the experimental data.The adsorption process of Mg²⁺and Cd²⁺is more in line with the Langmuir isotherm model,which belongs to single layer adsorption.The adsorption process of phenol is more in line with the Freundlich isotherm model,and the adsorption process is multi-layer adsorption.The magnetic field promotes the adsorption of metal ions by the adsorbent and suppresses the adsorption of organic substances.Compared with the traditional adsorption materials,the NH₂-SH-Fe₃O₄/O-MWCNTs composites exhibited excellent adsorption performance.The magnetic field and the adsorbent materials can co-efficiently treat heavy metals and phenol under certain experimental conditions.